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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24ce39d4ba8cb545fe149a1bd760dcaccfe5cb3846202bdb054a5e9e517fe02a' 
  AND token = 'QBUr9mTaNMvdPhPRFAMls52cNOh/GHMQbaTN5uvXFLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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