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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9889bda2b7d93aeafeb46bc079d7d98125dc99821e92961a9350e0f9b84294b' 
  AND token = '4B7hwMoErqrbZX4+zEhdgIC/qWFjUqqSd58umhjc3x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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