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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ae8bf7def6dfb741756ca2c6b4fafbce568f0eff487f90cff3bd3f9ce30defe' 
  AND token = 'WiArTSo3xShwgW+VQkZP3M+rkhI9x0GqmqLvQQDANak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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