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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a733fbd81a721678aa2f8a4ca37e7fe783acb503e84101c3f9b8dec08ffc10c' 
  AND token = 'MsImYPcpk/Qr89I7tavDmLWBc9l4WtRF7a8dMFLKn2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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