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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a53904239e413a2bea95084703b442275010cf1b22370f070ee6316ec27d7206' 
  AND token = 'ag6X4xdZ3EOIb3SEUx+lufl5ynoyPGdvRzvCI9Y7/aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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