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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '396dd7e845ff7a426cf8dc2eae827f2d0e09e391d3e4bf026f5e1d3e659eb017' 
  AND token = 'dv7hzgszUGgDYf0s51F65xZxWfts7GmlW/EmfppptAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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