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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b63f7b06d5fc269deca66337b51777315b9ffe0ec85e606b343b714c3e10210b' 
  AND token = 'wmze94AyM2U16/g0OefeGw6xIaDDRrFCY/wCk83gy9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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