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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0623a90bc1099c2901f3352885bbcf313e2c65c37c20691e60e734ee7ae65ee' 
  AND token = 'ZBCM7Vvd/mIOCGOSS+lHFSEBxMhEtxg7K07Q3UOMBSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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