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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7c808f095c31c4821642763cfae10dc933aff6bb5dc3f46574aa4b5e140f256' 
  AND token = '/lsogZ+et2tyc9p6/95bKTN4+63J/bAbbyPwkHgPosU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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