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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4ce067a81f99c640039f7bf67aec0e3db351923e50655a26245b04b5f014e36' 
  AND token = 'QsHNLKcmqCrCEUnuyoGanDeIM6Bit/aGvY20I17nM2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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