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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa0730f34e606b983cda70ad0c0c8132a013063fcdc711c99e3322bf96d17c48' 
  AND token = 'FrCY5xrRkqm6VIfgpS/zbbeq7rJ+wH+tp+yA1ZOpzk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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