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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1953fb15d0161913711e059bdb0f50b79787362e6e14663f1deca0ad332ad3a3' 
  AND token = 'QFAbxPukPN7d+FR633VREdXZ13w9ipYlsELQib+04vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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