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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7034ed7bb7c9692e3570966deaf8b0558459a0626db120eb96fc2ebb7ee43a68' 
  AND token = 'BjVGKLi9MsDOJ6N0eikfqgJfR2CUV51ZgNTnytDgaVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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