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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eea2d9f5320a04a6177521a75482ccab0c55c1e78a244b3a9c941aa3ce63edb2' 
  AND token = 'vrQGINUB6SrsZiwFjLfg4EoWBco6prpcsfKB6BPxxNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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