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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '628a5a7709c40ebdc7e596ddc20764d06f94b4ec6ae1741c908b05c71e278ac8' 
  AND token = 'eh44cz8P2U9n/gcP3XoJPTdqJ7wpOFFgDhYQ+7mnS0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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