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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb2028678df5f4f80930718e1ec26fdaedd01052fd5c26268d877d48a276e4e0' 
  AND token = 'yEZCqBqsI69xDoCJvGLNR9yTqYKIj840PDwfsYol2e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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