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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84ec622cc40c5ef8d8f94e0dd170fda9de74fa53ef47ebd04ed5506f0a20095e' 
  AND token = 'Wwk1q6bmm51W88Pxr17FD9IhORbqrB2t8TQKT69R9mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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