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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88e35f697e6df6c0183bbabf7250ee6e336660b696e05d6987c320e79bacd357' 
  AND token = 'laT9CZLq1+SeX9ZXZDwnli1qxJhJ357tnv4FH1nvz24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}