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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4352a7f00eb5152f3a5d45aed290d02146391932dc544a1bd93ae8f860fdf1ca' 
  AND token = 'Y/jnEIaF3bChp2sPob2s7fB3I0WAUy7ELoE4f81p25Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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