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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1b87d2f887832ed22f5873ab071a3971eadce2619bee35fa4ed0e7d78967d3c' 
  AND token = 'sjdzW6maZxl1XuduHTxudv1/HG7mIQT1jpd7Cs8e+U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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