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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f36e12e0b17200cbe7df522d58046499acb1d53a62c0d24d6ae242ad112d05a' 
  AND token = 'kZcuNKepx5yKGhVolAKYtPWVQknDzX/6YeKMQWckDyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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