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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '853c9ce782772c0497db30136fb6527e611e653fe2a585376e04690727188c64' 
  AND token = 'hsE7COy6H+eBeq782IHpLvcHDerls5WyrZ26h7lRaOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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