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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e936e6a7a286c62569eeaa71aafe380cc79797def9f92c5b742ec573fd00d1b' 
  AND token = 'Hu4QcqPL6wO0dBQ+8bkMC0x2rvKQyeARQCJW0GhnWw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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