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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4bf9b55297b0cd338f3c5b0912eef715faeb13fb48864b99c3ffb46b15053cd' 
  AND token = 'UbNy35BKwUatnI+S74C+5XUUc71j9yaLPeK6xp5qGRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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