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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f46e1b8ec82bcb77c5c749581d10c231ae5c38acfabc8f619ad7ff760b757de0' 
  AND token = 'Us6bI+ptNkxfEfxkurzhNBj7arjstgsg+0ibwQrbXUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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