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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b3293c84e37d0d9b57e3eff9bb42e6ff12f4ed52db5d4f03064e03f97894f52' 
  AND token = 'Dvgnxso3cr14fnOkv3m3KDqPBrQOKBpQYSNPR6mI6Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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