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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abf4d0be0f8d7b863a51094fcb46d0d3232d9ce2175296ae702f8409b086283e' 
  AND token = '6h7Si5i6HR+7hGgMhMe4IfiC5JKecRXFB4zeJvAe3ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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