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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b947d2ad1819b17b31c3d1d44aa008c9a69d42b8a0d5512db76356530340195d' 
  AND token = 'uW0d802BirzYhmSUGbOoX+1bStcCc6yKK3/JVrGRF5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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