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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6f5247d870728e8fd68fb1f754357506e108db7bf82fc56b72fd6256165f64b' 
  AND token = 'kHFd0K/KmzfnffaapjOjTXR5Rfwwt7X5GGqjiZwrvCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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