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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8b7962b91acbac768105ee01a2688aeb3f9fb50cc47b7c51c379bfbbf285edf' 
  AND token = 'O7CIFk1uiGDpJ+poU8EUJiCbrYEk00PTmjyum65R85U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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