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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68933b76091fd98265937aa5a940acd8d48952ac3b2c9fc156b1d6d51db2ca69' 
  AND token = 'sHxr5TmIqk8xZrMXdErB0NBxbjCr4BqVz+ph2tEkJ+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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