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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b20d3059cf64e205660c1d7fb0a847ef67c14c8cbdcb25d04996357c04dc8021' 
  AND token = 'GCIJEkn365ekPBm8l5Lg6Z5zkVUco+S8Fo9p7VWVs0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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