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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc54048f8b3977349ecdf128810ed1dd0a9d1c1d93c605792902a13ac0c3009a' 
  AND token = 'mIq9psVJsIG4XuYuBUtBbZB/aa4/g+ETenktzeyn+sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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