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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2ff91419f365acbf0d969d6272026949769f2e432e80ad1a58e7a490e671360' 
  AND token = 'i3Hj38jFQ/NwpLhxt2VxXdU5hGd8MFhT0EV5x3RpqQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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