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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8541f05c17fad435c77412d0a93fc2493991f469947f3f0e705d2444f3e0c58' 
  AND token = '6EQZo8+xE7K9DNxEbctQ6HmXs8xFex25b78T9FY+P+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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