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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb404f2e0666fd6e88edb357eeb062da807c2b4fc7627e4c4275823ae82edc3b' 
  AND token = 'KRxet4BDapVYj8uQcD73F3ws6YyuIJnitlBhzngWuaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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