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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '628c6d1ccc883f28222bb7b74ea7554283aa7018ee0bd5b09aa366db23302b7c' 
  AND token = 'dQ7BXNpmslpJ2EdIPYZFP9C1oDYBxGq4ujlk5Z7rsx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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