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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0708775492a3a4cc93b27bdb3792259d3705ef3cdab1f5b2e44f71fee604ca64' 
  AND token = 'VXOp6a/f4VdTVdpcqGf2DftJ2na3ePgigeJgc5Ldl4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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