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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db799d3f171c1e821be1b277f41794ce43e241c9846a94551239f0c8b5d1b201' 
  AND token = 'k39Zx63UZ57Wmg2FI0Sy2Q1UWbix/rAljw52tS2FOBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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