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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5c9af9c6aa5c512341d3c9dde57e635e670fa914a326e9d1221a28fb6961c99' 
  AND token = 'd6NW2Cvtx6yssUNawDiCxtHz2hkbJ428WbEqU23E/2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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