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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38de8d4a243aeeba844f0563ed05ffe53d1bd9f26d95da1f7efab24d9b022ef3' 
  AND token = 'GANq/F3fWdYh2B01ogwgNMrNCj/9kWI51Gz4IZ2N34c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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