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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd996960bea00aa5af9ecb26bc74500ae38d572c644934e8d112c06e9edced70' 
  AND token = 'ub1e36HgL2kfhkCjkccjTPrNGXRRbXWZVH2TnF02xyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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