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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3172ca7c866a81f2711818b76d12e7aa3bfad44b991ecc4888394b439603dad5' 
  AND token = 'W3vv77gTk0YSGCypZDwaIq7Es9OxBCLDfsbpgO6umrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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