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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6cad097b860679f7f0fef9f207ccf5a8b68823f3a0e7db096c13dc23cf160e8' 
  AND token = 'xTeJEE9HNtxpa01Eqr7Ugo0pygpf/EUL+QEQYA1AgeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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