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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c23e491d150de757c64fbb299e2f25dd5814d28b5d8a2f7ec54c2a880ed3b54a' 
  AND token = 'P2DCoEXb+JnMBqKftF0p1xXVX9cfZBksa2Hg0snStHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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