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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58a334b42a2ee70edb2638c87224b94ebf8a8003f9fe1a8473ce77bde2c70340' 
  AND token = 'ZNJBIjugX1Hd6dnIuAcoGBLwSA6AqpbU8JiLp8X2vus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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