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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb94cd1339d6830f5dbd8b55ede779c05e596a3a92060b3c1834f796165f9a6b' 
  AND token = '7u98c2RzPYe18UFh1atUu54HzI9qtWbjniBvyIKvqaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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